or you can use a 7m-gte cooler then extend some pipings and mount it in the front position.
good budget upgrade.
thats what im going to do on my rb20det.. should be good for a basicly modded engine (filter, exhaust, bit more boost) should be good for around 180ish or so rwkw
ill have a DIY writeup soon. ill chuck it up on the dyno as well to see the increase.